Welcome to Medical News Today

Healthline Media, Inc. would like to process and share personal data (e.g., mobile ad id) and data about your use of our site (e.g., content interests) with our third party partners (see a current list) using cookies and similar automatic collection tools in order to a) personalize content and/or offers on our site or other sites, b) communicate with you upon request, and/or c) for additional reasons upon notice and, when applicable, with your consent.

Healthline Media, Inc. is based in and operates this site from the United States. Any data you provide will be primarily stored and processed in the United States, pursuant to the laws of the United States, which may provide lesser privacy protections than European Economic Area countries.

By clicking “accept” below, you acknowledge and grant your consent for these activities unless and until you withdraw your consent using our rights request form. Learn more in our Privacy Policy.

Please accept our privacy terms

We use cookies and similar technologies to improve your browsing experience, personalize content and offers, show targeted ads, analyze traffic, and better understand you. We may share your information with third-party partners for marketing purposes. To learn more and make choices about data use, visit our Advertising Policy and Privacy Policy. By clicking “Accept and Continue” below, (1) you consent to these activities unless and until you withdraw your consent using our rights request form, and (2) you consent to allow your data to be transferred, processed, and stored in the United States.

Get the MNT newsletter

Email an article

You have chosen to share the following article:

How elderberries can help you fight the flu

To proceed, simply complete the form below, and a link to the article will be sent by email on your behalf.Note: Please don't include any URLs in your comments, as they will be removed upon submission.

We do not store details you enter into this form. Please see our privacy policy for more information.

Black stool has a distinct appearance. The main causes are eating certain foods, taking certain medications, and gastrointestinal bleeding. If a person has blood in their stool or any other symptoms of bleeding, they should speak to a doctor immediately.

A variety of foods and medications can make a person's stool black. These can include:

According to NIDDK, the gastrointestinal tract can bleed for many reasons. Some are listed below.

Angiodysplasia

A range of conditions can cause black stool.

Authors of an article in the journal Alimentary Pharmacology & Therapeutics describe angiodysplasia as abnormal groups of vessels in the mucous membrane of a person's gastrointestinal tract.

It is not clear why angiodysplasia happens, but it can cause bleeding and blood in a person's stool, which can make it black and tarry.

A common treatment is argon plasma coagulation, which doctors use to seal the bleeding vessels.

Benign tumors and cancer

According to NIDDK, benign tumors or cancerous formations in the esophagus, stomach, colon, or rectum can cause blood in a person's stool, which may make it black and tarry.

A benign tumor is a tumor that is not cancerous. Whether they are benign or cancerous, tumors can weaken the gastrointestinal wall and result in bleeding.

Colitis

Genetics Home Reference define ulcerative colitis as a gastrointestinal disorder that causes ulcers to form within the large intestine. This can result in blood in a person's stool, which may make the stool appear black and tarry.

NIDDK note that the cause of ulcerative colitis is unclear. Doctors can treat the condition with medications and surgery.

Liver issues can cause esophageal varices, which are enlarged veins in the esophagus. Treatment will focus on stopping the bleeding and resolving the underlying condition that is causing the esophageal varices.

If a person experiences gastroesophageal reflux frequently, they may have gastroesophageal reflux disease (GERD).

The key causes are complications from certain medications, smoking, or increased pressure in the abdomen. This pressure can result, for example, from being overweight or pregnant.

A person can often manage GERD by avoiding certain foods and not overeating. A doctor may also prescribe medications.

Stomach ulcers

If an ulcer forms in a person's stomach, this can cause bleeding which may make the stool black and tarry.

NIDDK note that the long-term use of some drugs, such as ibuprofen and aspirin, can cause stomach ulcers. A bacterial infection can also be a cause.

As well as blood in a person's stool, symptoms include:

dull, burning pain in the stomach

bloating

burping

vomiting

having a low appetite

losing weight

If a doctor thinks that drugs such as ibuprofen or aspirin are causing stomach ulcers, treatment usually involves no longer using these pain relievers.

Or, the doctor may prescribe medications to help fight a bacterial infection.

Outlook

If a person's stool is black because of what they have eaten, the color will eventually change with the diet. However, there is no reason for people to avoid foods that have this effect if they are not experiencing any other symptoms.

If bleeding in the gastrointestinal tract is responsible for black, tarry stools, a doctor will need to diagnose the exact cause of this. Many gastrointestinal issues are treatable.

Prevention

A doctor can offer advice on lifestyle changes to prevent black stool.

A doctor will have to determine the underlying cause of bleeding in the gastrointestinal tract in order to treat it, if this is the reason that a person's stool appears black and tarry.

They may recommend that the person avoids certain foods. Also, the doctor may advise against taking specific medications and propose alternatives.

Some causes of bleeding require minor surgery to correct.

The doctor will be able to advise on the best way to prevent further bleeding in the gastrointestinal tract, based on the diagnosis, as well as any lifestyle changes that they think the person should adopt.

Takeaway

If a person's stool is black, the likeliest reasons are that they have eaten certain foods or that there is bleeding in their gastrointestinal tract.

For a person who has no other symptoms and who suspects that foods are to blame, there should be no cause for concern.

However, if a person notices blood in their stool or experiences any other symptoms, they should speak to a doctor, who can determine the cause.

2019 Healthline Media UK Ltd. All rights reserved. MNT is the registered trade mark of Healthline Media. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional.